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Numerous applications in mechanical CAD/CAM need robust algorithms for the identification of protrusion and depression features (DP-features) on geometric models with free-form (B-Spline) surfaces. This paper reports a partitioning algorithm that first identifies the boundary edges of DP-features and then creates a surface patch to cover the depressions or isolate the protrusions. The novelty of the method lies in the use of tangent continuity between edge segments to identify DP-feature boundaries that cross multiple faces and geometries.
Three-Dimensional geometric feature recognition, geometric modeling, CAD, CAM, CAPP.

T. Lim, J. Ritchie, J. Corney, C. Torres-Sanchez, J. Davies and H. Medellin, "Edge-Based Identification of DP-Features on Free-Form Solids," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 27, no. , pp. 851-860, 2005.
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